Question 394239
  <pre><font size = 3 color = "indigo"><b>
Hi
f(2)=x^2-4x+4 = 0  then Pt(2,0) is the vertex OR a turning pt
Note: In this example the vertex is a minimum point
{{{drawing(300,300, -6, 6, -6, 6, grid(1),
circle(2, 0,0.3),
graph( 300, 300, -6, 6, -6, 6,0,x^2-4x+4))}}}